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rudder

[ruhd-er] /ˈrʌd ər/
noun
1.
Nautical. a vertical blade at the stern of a vessel that can be turned horizontally to change the vessel's direction when in motion.
2.
Aeronautics. a movable control surface attached to a vertical stabilizer, located at the rear of an airplane and used, along with the ailerons, to turn the airplane.
3.
any means of or device for governing, directing, or guiding a course, as a leader or principle:
His ideas provided a rudder for the new company.
Origin
900
before 900; Middle English rodder, rother, ruder, Old English rōther; cognate with Old Frisian rōther, Middle Dutch rōder (Dutch roer), Old High German ruodar (German Ruder); akin to row2
Related forms
ruddered, adjective
rudderless, adjective
rudderlike, adjective
unruddered, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un ruddered

rudder

/ˈrʌdə/
noun
1.
(nautical) a pivoted vertical vane that projects into the water at the stern of a vessel and can be controlled by a tiller, wheel, or other apparatus to steer the vessel
2.
a vertical control surface attached to the rear of the fin used to steer an aircraft, in conjunction with the ailerons
3.
anything that guides or directs
Derived Forms
rudderless, adjective
Word Origin
Old English rōther; related to Old French rōther, Old High German ruodar, Old Norse rōthr. See row²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for un ruddered

rudder

n.

Old English roðor "paddle, oar," from Proto-Germanic *rothru- (cf. Old Frisian roðer, Middle Low German roder, Middle Dutch roeder, Dutch roer, Old High German ruodar, German Ruder "oar"), from *ro- "steer" (see row (v.)) + suffix -þra, used to form neutral names of tools. Meaning "broad, flat piece of wood attached to the stern of a boat and used for steering" is from c.1300. Spelling with -d- for -th- first recorded mid-15c. (cf. feather, mother, gather).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for un ruddered

rudder

part of the steering apparatus of a boat or ship that is fastened outside the hull, usually at the stern. The most common form consists of a nearly flat, smooth surface of wood or metal hinged at its forward edge to the sternpost. It operates on the principle of unequal water pressures. When the rudder is turned so that one side is more exposed to the force of the water flowing past it than the other side, the stern will be thrust away from the side that the rudder is on and the boat will swerve from its original course. In small craft the rudder is operated manually by a handle termed a tiller or helm. In larger vessels, the rudder is turned by hydraulic, steam, or electrical machinery.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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